M.2 SATA Express vs PCI Express 3.0 x16 slot 1 & 3 in SLI

[TWP-WOLF]

Dear ASUS Staff & Forum Members.

I'm in a process of building me a new computer based on ASUS ROG RAMPAGE V EXTREME, 2 x ASUS ROG MATRIX GTX 780 Ti PLATINUM in SLI, Intel Core i7-5930K Haswell-E & Samsung XP941 512GB M.2 NGFF PCIe x4 SSD (MZHPU512HCGL) among other things.

So if I run the Samsung XP941 512GB M.2 NGFF PCIe x4 SSD as an operative system disc at the ASUS R5E M.2 SATA Express contact, will my 2 x ASUS ROG MATRIX GTX 780 Ti PLATINUM still run in SLI at the PCI-E x16 3.0 slot 1 & PCI-E x16 3.0 slot 3?

Since the ASUS R5E M.2 SATA Express contact share bandwidth together with PCI-E x4-1, PCI-E x1-1 & PCI-E x8-4 slots I wonder if my ASUS ROG MATRIX GTX 780 Ti PLATINUM still runs in SLI at PCI-E x16 3.0 slot 3 or does it make the slot 3 run in PCI-E x8?

I apologize for my poor formulation due to lack of knowledge in the English language.

If you have hard to understand the above, please don't hesitate to ask me for a clarification.

Yours Sincerely, Bengt "WOLF" Johansson.

[theMoP]

afaik, m.2 technology (for the consumer) is still in its generation 2 iteration, i.e. ngff

generation 3 m.2 is just around the corner with nvme, i.e. something like the samsung sp951 (probably released around nov this year to jan next year)

only this third generation of m.2 in conjunction with the r5e's socket 3 pcie x4 gen 3 m.2 interface will allow the 32gb/s that asus has been claiming in the r5e's marketing

[TWP-WOLF]

Dear theMoP.

Thank you for your nice post.

Yes I have seen that as well and it looks really interesting.

The question is if Asus Rampage V Extreme are supporting M.2 NVMe.

Regards, WOLF.

[RamCity]

Hey Guys

Thanks for posting up this information. We received a report from another ASUS Rampage V Extreme user today that they could not get the XP941 to boot until they altered this M.2 setting in the UEFI, which by default is set to [AUTO], but needs to be set to [M.2]. We've noticed this problem with other ASUS Z97 motherboards too. It seems the [AUTO] setting doesn't work with the XP941.

As far as I can tell from the manual, the M.2 setting for the ASUS X99 Rampage V Extreme UEFI appears to be here:

Advanced > Onboard Devices Configuration(PCIEx8_4 and M.2 Configuration): [M.2]

See page 3-39 of the manual here for details:

http://dlcdnet.asus.com/pub/ASUS/mb/LGA2011/Rampage_V_Extreme/e9550_rampage_v_extreme_ug_for_web_onl...

Hopefully this helps someone else who might be tearing their hair out.

Rod - Vendor Rep for ramcity.com.au

[Aegis156]

A quick question.

the M.2 slot (when selected to M.2 in Bios) will limit the Linked slot to x4. I plan on using the Samsung XP941in the dedicated M.2 slot. my question is can I take something like the:

Bplus Dual M.2 PCIe SSD to PCIe 2.0 x4 adapter in the linked expansion slot, put all three cards in Raid and boot them? I'm curious if it is possible not whether it is practical.

[mdzcpa]

My set up is bit different, but with the Plextor M6E 512GB M.2 both of my Titan Blacks run X16 PCIE 3.0 just fine. The Plextor M6E is only X2, so maybe that's the difference, but I doubt it. ASs I said in the other thread, this problem sounds build specific.

[ariskar]

Samsung SM951 is coming out to replace XP941 soon. Waiting for that could also be an option if you have a transferable boot drive to later clone.

They indeed could be build specific Roland2, yet still a probable issue. In any case it may be solved by future BIOS updates, as it doesn't seem to be a hardware issue (the slots are able to run x16 without the M.2. Anyway x8 gen 3 is not a bottleneck for a high end single GPU (ex. 980)